Problem with custom entities (invisible)

[UnknownCharacter999]

I use only Photoshop CS5 with the nvidia (.dds support) plugin.
I need to change ONLY the texture of the custom entity.
You can say, that the problem is in my texture, but if you replace the standard texture of the entity, then it's appears in the game. and if I copy custom entity in my own folder (entities/my_entities), then amnesia/lvl-editor crashes or entity becomes invisible